FROM Perrette to de Pablo, McCallum to Murray, NCIS has one of the most talented ensembles on prime time. But it also has one of the most entertaining sideshows: Michael Weatherly, who has spent nine seasons cracking cases as Agent Tony DiNozzo and nine seasons cracking jokes—usually at his own expense—as the beloved NCIS mascot. Watch! spent a day with the 42-year-old actor on set in Valencia, Calif., hanging out behind the scenes, riding shotgun in his SUV and generally trying to keep up as Weatherly did what he does best: keeping the place on its toes.

After Tony's ex-partner, Danny Price (guest star Scott Grimes), appears to be the Port-to-Port Killer's latest victim, he revisits his days as a detective in Baltimore, including his first encounter with Gibbs, on NCIS, Tuesday May 3rd, 8pm ET/PT on CBS! (Photos Below)

After Tony's ex-partner, Danny Price (guest star Scott Grimes), appears to be the Port-to-Port Killer's latest victim, he revisits his days as a detective in Baltimore, including his first encounter with Gibbs, on NCIS, Tuesday May 3rd, 8pm ET/PT on CBS! (Photos Below)

Tony DiNozzo is being utterly condescending to Leroy Jethro Gibbs for the very first time — and the last. Shooting an NCISinterrogation scene unlike any other, Michael Weatherly and Mark Harmon are in flashback mode, circa 2001, facing off as captor and the captured. An abandoned newspaper office building in downtown Los Angeles has been transformed into a Baltimore police station, where DiNozzo has brought a handcuffed Gibbs in for questioning after tackling and arresting him on the street. When he learns that his future boss is not a crook but an undercover NCIS agent, he is dumbstruck — by Gibbs' seeming stupidity in getting busted. (Video & Photos)